To further compare the RD performance between different methods, the BD-rate gains measured by BDBR [1]} by setting H.264 as the anchor and the results are summarized in Table. REF . As consistent with the results of RD curves, Table. REF  also illustrates that the proposed model performs significantly better than other methods under the metric of MS-SSIM, achieving the SOTA RD performance. In terms of PSNR, the RD performance of the proposed model is better than that of the other learned methods on UVG/MCL-JCV datasets and is competitive to that of H.265. The BDBR results also reveal that the RD performance of the proposed model is slightly worse than that of other learned methods on HEVC Class B dataset in terms of PSNR. Meanwhile, the proposed w/o SPM has a slight degradation compared with the proposed method, which is also stated in the ablation study.
